The idea is in addition to doing what it does, software is also required to do it well.

How effective do you think Google would be if it took 5 minutes to give you a response to your query?

I believe by categorizing your backlogs in this way, you will able to get more ideas on what is to be included in the final product as well as appropriately prioritize the various backlogs resulting from it.

How do you categorize backlogs in your own organization? How did you handle it?